Vacuum cleaner



FIG. 1 is a top, front and right side isometric view of a vacuum cleaner showing our new design;

FIG. 2 is an enlarged isometric view thereof;

FIG. 3 is an enlarged front elevation view thereof; and,

FIG. 4 is an enlarged right side elevation view thereof, the left side being a mirror image.

The broken lines show elements of the vacuum cleaner that form no part of the claimed design. 

CLAIM We claim the ornamental design for a vacuum cleaner, as shown and described. 